Stone-saw.



J. RUSS.

SIONESAW.

- APPLICATION FILED MAY15. |915.

Patented Sept; 19, 1916.

wlTNssEs AUNITED STATES PATENT curio.

JOHN RUSS, -OF LA SALLE, NEW YORK, ASSIGNOR TO THE CARBORUNDUM COMPANY,

OF NIAGARA EALLS,--NEW.YORK, A CORPORATION OF PENNSYLVANIA.

STONE-SAW. v

Specification of Letters Patent.

Patented sept.' 19,1916.

l Application filed May 15, 1915. SerialNo. 28,293.

l To all whom/ it may concern.'

Be it known that I, JOHN Russ, a citizen of the United States, residing at La Salle, Niagara county, New York, have invented a new and usefulImprovement in Stone-Saws,

of which the following4 is a full, clear, and exact description, reference being had tothe accompanying drawings, forming part of this specification, in which- Figure lis a side view 4of a portion of a the lines II--II .and III-III of Fig. 1. Figs. 4-and 5 are, respectively, edge and side views illustrating a porticn'of a stone saw, embodying my invention in a modified form,

and Figs; 6 and 7 are views similar to Fig.` 1,

and showing two other modifications. Y

My invention has relation to an improvement in stone-saws.

Saws for the cutting 'of stone having insisting of carborundum grains molded onto the metal piece with arubbe'r or similar cementing material.

The object of my invention is to do away with the metal insert and to provide a saw having a solid tooth formed of agglomerated carborundum grains, and which tooth combines the functions'both of the cutting i Aelement and ofthe attachable metal insert.

I have discovered that if a solid tooth is made with carborundum grains and an elastic bond, such as shellac, such tooth can be successfully wedged in the socket in the saw blade, and when so attached, has no tendency to work loose. In order to accomplish this, the tooth must have elasticity, and it must be placed under some strain when in-V lserted in the blade, so that any slight crushing of the edges engaging the blade, or any tendency to work loose, is quickly followed up with the elasticity of the tooth in its en-v deavor to resume its normal shape.

An elastic bond of the character describedv is highly resistant to compression or bending, S0 that the tooth, while sufficiently com- 5 holds the latter firmly in place.

pressible to be slightly deformed without rupture when put under strain in its socket, is sufficiently vhard and stiff -to be firmly.

gripped by the' socket walls and to with ,the socket being considerably wider than the tooth and having V-shaped grooves 5 alongA its bottom and at the two sides. One of their l p10 v cut or dovetailed in form. The `tooth 47 1 formed with an enlarged "base 6 having-.1.

side edges of the socket is preferably undei'll beveled lateral and bottom edges of double beveled form, and adapted to fit in the V" grooves at the bot/tom and one edge of the socket. After the tooth is inserted al wedge 7 is seated between'the straight edge of the socket and the adjacent edge of the tooth.` This wedge has a 'vfgroove 8 at one edge to,v fit the adjacent beveled edge of the tooth, and a V-bevel at the opposite edge to fit'the. V-groove in the adjacentedge of the socket, and is driven in tightly until 'aslight strain is put'upon the tooth. A The extent of this strain can be readily determined by trial. l

In the modification shown in Figs.v 4 and 5 the saw blade 2a. is split at intervals between adjacent teeth, as indicated at 9. The sockets 3? for the teeth have 'V-grooves in their vertical edges to engage the correspondingly beveled base portions of the teeth; and after the teeth ,have been inserted in these sockets, wedges 10 are driven in the arc of a circle at one side, as indicated at 11,

and the other side' has the straight beveled edge portion 12. The base of the tooth is cut away on the under side as shown at 13. The wall of the tooth socket has a/continuous V-groove 14. A wedge/lfdriven'between the bottom of theY socket andthe up-y per wall of the cutaway portionof' the tooth In the form shown in Fig. 7 the tooth is driven in to engage the two grooved sides of the socket 16 and is then held in4 place by a pinvor rivet 17, which is-seated partly inthe wall of the 'socket and partly in the tooth, so as to form'a key.

lreferably the lteeth are made with a taper, as shown in the vertical crosssection in F ig. 2, so as to be thickest at its cutting face. rhis is for the purpose of giving clearance so that the tooth will not bear on thev sides of the stone through Vwhich the cut is being made. As the tooth wears down there always a clearance between the stone and the saw.

Teeth in accordance with my invention can be applied to-saws` of the reciprocating type, to circularsaws, or to saws used for coring. l lindthatthe use of 'these teeth results in great economy, both in the increased life of the teeth and from the in.

creased rapidityA of their cutting action. They are very easy to replace, and are much cheaperl to 'produce than either the diamond l teeth or the carborundumv mounted on a steel back or insert. Teeth made and secured in the manner described also give a much smoother iinish than does thediamond saw, thereby requiringless subsequent rubbing of the stone, where a smooth finish is wanted. l do not wish to limit myself to the particular ways. ofv securing the teeth which I have here shown and described, as it is obvious that they may be shaped in various ways and may be wedged in place by various other` means withinthe spirit and scope of the appended claims.

By the term elastic bond as used herein and in the appended claims, l refer to a bond having a relatively high elastic-limit, and not to a material having a high modulus of elasticity.

I claim: i

l. A stone-saw consisting of a blade provided ywith sockets spaced along its cutting edge, each socket having therein a replaceable tooth ,consisting of abrasive grains 'bonded by an elastic and highly resistant bond, each tooth having a portion which directly engages the wall of its socket.

2. A stone-saw consisting of a blade provided with sockets spaced along its cutting edge, each socket having therein a replaceable tooth consisting of abrasive grains bonded by an elastic bond, the sides of each tooth engaging its socket along at least two edges thereof, and wedging means for holding the tooth in the socket under strain.

3. A stone-saw having a replaceable tooth i formed of abrasive grains bonded by an elastic bond, and means securing the tooth in the blade and acting to place the tooth under strain. v

4.. A stone sawtooth, consisting of a areas@ high elastic limit and composed of abrasive grains bonded by an elastic bond, and means for forcing the tooth-engaging walls of the sockets toward each other to grip and bodily compress the material of the teeth'whereby loosening ot' the teeth is prevented.

. 6. A stone saw consisting of a metallic blade provided with sockets along its cutting edge, teeth replaceably seated in said sockets, each tooth being formed Vof a flat comparatively long molded body of a compressible material having a high elastic limit and composed of abrasive grains bonded by an elasticbond, and means for securing veach tooth in its socket, and bodily compressing' its material to shorten it lengthwise, said teeth because of their high elastic limit tending to resume their original length and maintain a tight lit in the socket under conditions of use.

7. A stone saw consisting of a metallic blade provided with sockets along its cutting edge, teeth replaceably seated in said sockets, each tooth being formed of a molded body of a compressible material having a high elastic limit and composed of abrasive grains bonded by an elastic bond, and means for securingA each tooth in'its socket and bodily compressing its material whereby loosening of the tooth is prevented.

8. A stone saw consisting cfa blade provided with sockets spaced along its cutting edge, each socket having one of its tooth* engaging side walls formed by a flexible tongue integral with the saw blade, teeth replaceably seated in said sockets, each tooth y being formed by a molded body of a compressible material having a high elastic limit and composed ofv abrasive grains bonded by an elastic bond, and means for -forcing the toothengaging tongue toward the opposite wallof the socket. to grip and compress the tooth in the socket.

ln testimony whereof, I have hereunto set my hand.

JOHN RUSS.

VVitness/es:

- O. HUTCHINS,

F. J. TONE. 

